干旱区生态环境知识资源中心(Arid): Self-Entrainment Motion of a Slow-Moving Landslide Inferred From Landsat-8 Time Series

Arid

DOI	10.1029/2018JF004920
	Self-Entrainment Motion of a Slow-Moving Landslide Inferred From Landsat-8 Time Series
	Lacroix, Pascal 1; Araujo, Gael 2; Hollingsworth, James 1; Taipe, Edu 2
通讯作者	Lacroix, Pascal
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
ISSN	2169-9003
EISSN	2169-9011
出版年	2019
卷号	124 期号:5 页码:1201-1216
英文摘要	In mountainous environments, slow-moving landslides (velocities <100m/year) are a major concern for local populations. Rainfall is often the dominant forcing, and often result in major changes in kinematics which can mask smaller signals related to internal forcings. We focus here on a major (>40Mm(3)) slow-moving landslide in the desert of southern Peru and take advantage of this arid environment to study the internal processes affecting landslide kinematics. We first estimate the ground displacement from time series analysis of Landsat-8 images, spanning a 5.7-year period. Systematic artifacts in the optical time series are shown to correlate with topography, as well as vary seasonally. We apply a novel procedure for correcting these artifacts, which significantly reduces noise in the resulting time series, thereby allowing us to precisely resolve landslide displacements. We find landslide velocities of up to 35m/year, with complex nonlinear interannual pattern, including a period of rapid acceleration. We validate our optically derived time series using Global Navigation Satellite System field measurements and find uncertainties (root-mean-square error) on the moving mass of 1.12 to 1.55m. Sudden acceleration of the landslide body after March 2016 may originate from a mass collapse due to retrogression of the headscarp. By coupling sparse 3-D Global Navigation Satellite System measurements with dense 2-D optical time series data, we show that the headscarp retrogression acts like a wedge, resulting in domino-like tilting of the downward blocks, and accelerates basal sliding over 2years. These observations reveal that the dynamics of this retrogressive landslide are predominantly controlled by sediment supply and that succession of retrogressive and advancing motions is a self-entrainment process.
英文关键词	landslide Landsat-8 time series retrogression validation image correlation
类型	Article
语种	英语
国家	France ; Peru
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000472611000008
WOS关键词	LONG-TERM ; DEFORMATION ; KINEMATICS ; DYNAMICS ; IMAGES ; FLOW ; CALIFORNIA ; EARTHFLOWS ; MOVEMENT ; RAINFALL
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	French National Research Institute for Sustainable Development
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217091
作者单位	1.Univ Savoie Mt Blanc, Univ Grenoble Alpes, CNRS, IRD,IFSTTAR,ISTerre, Grenoble, France; 2.Inst Geol Minero & Met INGEMMET, Lima, Peru
推荐引用方式 GB/T 7714	Lacroix, Pascal,Araujo, Gael,Hollingsworth, James,et al. Self-Entrainment Motion of a Slow-Moving Landslide Inferred From Landsat-8 Time Series[J]. French National Research Institute for Sustainable Development,2019,124(5):1201-1216.
APA	Lacroix, Pascal,Araujo, Gael,Hollingsworth, James,&Taipe, Edu.(2019).Self-Entrainment Motion of a Slow-Moving Landslide Inferred From Landsat-8 Time Series.JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,124(5),1201-1216.
MLA	Lacroix, Pascal,et al."Self-Entrainment Motion of a Slow-Moving Landslide Inferred From Landsat-8 Time Series".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 124.5(2019):1201-1216.